PHYSICS HIGH SCHOOL

The driver of a car is driving the car very fast.The car hits a crash barrier and stops very quickly.
Describe why the driver is injured.

Answers

Answer 1
Answer: because the persons head is probably slammed into some part of the car and that means that the persons slammed on the brakes really hard so the person is probably injured
i hope this helps
Answer 2
Answer: The momentum of the car is probably very large before.When it crashes. the momentum changes suddenly in a short period of time.
Rate of change of momentum = Force

So, as the momentum changes in a very short period of time, the force exerted on the driver is very large.So, he gets injured

Related Questions

Which of the following accurately describes the differences between the SI and English systems of measurement? A. The two systems are used interchangeably in the scientific and technical communities. B. The English system is more commonly used in Europe than in the United States. C. The English system is preferred for use in the scientific and technical communities due to its ease of use over the SI system. D. The SI system, which is based on the metric system, has been more widely adopted than the English system, which is harder to use.
This man proposed that all matter was composed of atoms
The National Grid supplied a house with 18,000,000 J of energy in 1 hour. What was the average current supplied to the house during that hour?
Displacement vectors A, B, and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 25.6° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 35.1° north of west. Find the magnitudes of vector B and vector C.
In which type of wave do the particles in a medium move perpendicular to the direction that the wave moves? A.transverse waves B.ocean waves C.surface waves D.longitudinal waves

If the amplitude of the resultant wave is twice as great as the amplitude of either component wave, and this wave exhibits reinforcement, the component waves must A. be traveling in the opposite direction of the resultant wave.
B. have a different frequency than the resultant wave.
C. be in phase with each other.
D. have a different wavelength than the resultant wave.

Answers

The correct answer for the question that is being presented above is this one: "B. have a different frequency than the resultant wave." If the amplitude of the resultant wave is twice as great as the amplitude of either component wave, and this wave exhibits reinforcement, the component waves must have a different frequency than the resultant wave.

Correct answer choice is:

C. Be in phase with each other.

Explanation:

Components waves mix to produce a resultant with the equivalent wavelength but the amplitude which is bigger than the amplitude of both of the unique component waves, and this results in constructive interference, which states that the interference of two or more waves of identical frequency and phase, constructing in their respective reinforcement and constructing a single amplitude equivalent to the total of the amplitudes of the unique waves.

Which statement is true concerning the evidence for black holes?Scientists can see black holes with powerful telescopes.

Scientists can see the effect of black holes on nearby stars.

Scientists can see trails left in space by black holes.

There is no evidence for black holes.

Answers

Scientists can see the effect of black holes on nearby stars is true concerning the evidence for black holes.

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 67 m when wurth (jaw6696) – Ch 2 LT 3/4 – kreft – (61920) 2 thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m.

Answers

Answer:

402m

Explanation:

We can solve this easily by using the free fall formula:

v_f^2=v_0^2+2ad

On both cases the final velocity will be 0m/s (maximum height), so we have:

v_0^2=-2ad

We know that the velocity the person imparts to the ball will be the same either on Earth or on the Moon, so we write for both cases:

v_0^2=-2a_Ed_E

v_0^2=-2a_Md_M

Which means

2a_Ed_E=2a_Md_M

So we get (taking into account that gravity on earth is 6 times gravity on the Moon):

d_M=(a_Ed_E)/(a_M)=(6a_Md_E)/(a_M)=6d_E=6(67m)=402m

1. What causes tides?A. The energy generated by waves.
B. The changes in Earth's climate.
C. The gravitational pull of the Sun on Earth's oceans.
D. The gravitational pull of the Moon on Earth's oceans.

Answers

Answer:

D.) The gravitational pull of the Moon on Earth's oceans.

Explanation:

A.) is incorrect because waves caused by the moon's gravitational pull. Waves and tides are essentially the same thing.

B.) is incorrect because climate change only has a small, indirect effect on the tides (i.e., rising sea levels).

C.) is incorrect because while the gravitational pull of the Sun affects the tides to some extent, it is nowhere near as influential as the Moon's gravitational pull.

D.) is correct because the gravitational forces between the Moon and the Earth are the primary cause of the tides.
it is letter d! :).

A twig from a tree drops from a 200m high cliff on to a beach below.during its fall 40% twig's energy is converted into thermal energy.what is the speed with which the twig hits the beach?

Answers

Calculating for potential energy P.E=mgh
m=mass
g=acceleration due to gravity
h=height
Let the twig's mass be M 

therefore at the start, the twig has 200*9.8*M potential energy. 

During its fall 40% twig's energy is converted into thermal energy and the remaining 60% of this will turn into kinetic energy during the fall, giving us 1176M
Now the equation for kinetic energy, K.E is 0.5*m*v^2
m is mass
v is velocity

Therefore 1176M=0.5*M*v^2 (mass will divide out)
velocity is 48.49 m/s

A protostar is _____.1.a region of space from which light cannot escape
2.a small star that will continue as a main sequence star for hundreds of billions of years
3.a star with a core of neutrons
4.the stage after a star completes its main sequence existence
5.the stage before a star becomes a main sequence star

Answers

Answer

5.the stage before a star becomes a main sequence star

Explanation

A protostar is a small star that is still gathering its masses. When it forms enough masses it make a parent molecular cloud.

This been the case, from the choices given, the correct statement about a protostar is;

5.the stage before a star becomes a main sequence star
its the stage before a star becomes a main sequence star. hope i helped you guys
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